NPPA and open-angle glaucoma: Moreover, the levels of the brain natriuretic peptide (BNP) and atrial natriuretic peptide (ANP), suggestively regulated by proinflammatory cytokines, were measured by RIA in the aqueous humor of glaucoma patients (41 POAG, 3 PEXG, and 3 CNAG) and control subjects (n = 47), although no significant differences were found [57].